Beles, Aurel A. Elliptic and hyperbolic paraboloidal shells used in constructions, / [by] Aurel A. Beles [and] Mircea V. Soare. - 4th ed. - London : S. P. Christie & Partnmers , 1976. - 751 p. : illus., diagrs. ; 25 cm. Includes bibliographical references. Subjects--Topical Terms: Roofs, Shell.--------Shells (Engineering).--------Paraboloid.-------- Dewey Class. No.: 624.177 BEL